Category: Administration / Server

“to swap, or not to swap, that is the question”: definately swap Shakespeare “to encrypt, or not to encrypt” (if it contains valuable data, encrypt) “to lvm, or not to lvm” (well….) because: one fine day, the user decides to […]

this might sound trivial, but there are multiple approaches: # for (theoretically every) Debian, but not every Debian based system: cat /etc/debian_version 11.3 # for Debian 10 and prior hostnamectl|grep Op Operating System: Debian GNU/Linux 10 (buster) # for Debian […]

lsb_release -a; # tested under Description: Debian GNU/Linux 10 (buster) su – root # create new file touch /scripts/shutdown.sh chmod +x /scripts/shutdown.sh # edit and insert orange content vim /scripts/shutdown.sh #!/bin/bash echo “=== shutdown as gracefully as possible ===” # […]

create a new shared folder on the nas call it “data” enable NFSv4, disable NFSv3 specify list of IPs that are allowed to access the NFSv4 share: don’t forget to hit “Apply” the idea is “anyway” to NAS<-directly-LAN-1000MBit->PC connect the […]

IDE, SCSI, SATA, SAS now U.2 M.2… that reminds of… USB Cable Salad of Madness – USB 3.0 and WiFi interference – Micro-USB USB-C mess has finally arrived the list of interfaces grows by the year? no U.2 is not: […]

will be redone soon

colorful text gives much more oversight. errors are easier to spot when they are marked in red colorful text is acchieved by defining color codes “switching” between color modes and back to default vim /scripts/colors.sh #!/bin/bash RED=’\033[0;31m’ WHITE=’\033[0;37m’ YELLOW=’\033[0;33m’ COLOR_OFF=’\033[0m’ […]

with virt-manager, it is a breeze to select the PCI device (in this case enp3s0 NIC) for pass through to guest vm, in case the vm shall get it’s very own dedicated nic: notice: the passed NIC dissapears from the […]

equals to: one neat function of the find command, it that what it found can be passed to another program for further processing. or: it can delete the file by adding the option -delete BUT (!!!) THIS IS DANGEROUS! as […]

privacy is worth swapping wifi cards! Open Source & Free Software are THE GOLD STANDARD which means: would ALWAYS prefer the hazzle of replacing a wifi mini card with an wifi mini card, that is supported by open source drivers, […]

inxi – Command line system information script for console and IRC DESCRIPTION It is also used a debugging tool for forum technical support to quickly ascertain users’ system configurations and hardware. inxi shows system hardware, CPU, drivers, Xorg, Desktop, Kernel, […]

and: is the EU / Germany location simply unattractive for many companies in view of the data protection craze? “In the end, it may be bitter for Quad9 that they only got into the trouble by moving to Europe, where […]

the positive vision (always start with something positive) if big data about every keystroke every step we make (the police: every step you make) algorithms determine how mankind will live and thus: technology is “neutral” until it is used for […]

it is actually like this, in virt-manager, that chipset and bios can only be changed during first setup “begin installation” it then is fixed and can not be changed in virt-manager

the most fundamental networking settings are ever changing it used to be /etc/resolv.conf where nameservers are set systemd is doing it’s own thing /etc/systemd/resolved.conf and Ubuntu (based on Debian) is doing (again) it’s entirely own thing (netplan) frankly: this sucks […]

nfs is to GNU-Linux what smb is to Windows: sharing dirs & files “The Network File System (NFS) was developed to allow machines to mount a disk partition on a remote machine as if it were a local disk. It […]

remember that discussion about ever changing non-standard ways of defining network interfaces and ip addresses under /etc/network… well guess what, canonical just came up with a completely new config file format X-D (guess, everything is a yaml.yml now) hostnamectl; # […]

raid10 combines the speed of raid0 with the resilience of raid1. watch out: shingled hdd are not good for RAID! setup of GNU Linux mdadm software RAID10 is actually pretty straight forward: no need to do any partitioning. # tested […]

first off the praise: kvm-qemu is a high performance nicely scriptable virtualization system if it works, it can do pretty things 🙂 especially like the x11 forwarded virt-manager gui over ssh (yes it is a bit slow… but simplicity at […]

intro: would the user pay 100€ per month for a super fast uplink (in this case Starlink, x>150MBit/sec!!! (it (of course) fluctuates, also there is a BATTLE going on between SpaecX (StarLink) & Amazon (Project Kuiper) which hopefully does not […]

a bit of a warning: this script is a bit of hardcore kvm “hacking” that might (sometimes) not work (kvm is under heavy development), wish to kvm and virsh-manager developers: please please integrate an easy way (like in virtualbox) for […]

update: 2021-08 from the TL-WA901ND menu: “Bridge with AP – In Bridge with AP mode, this device can be used to combine multiple local networks in distant hard-to-wire distant together to the same one via wireless connections. While bridging with […]

hostnamectl; # tested on Static hostname: lenovo Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-17-amd64 Architecture: x86-64 # with virsh –version 5.0.0 libvirtd –version libvirtd (libvirt) 5.0.0 /usr/bin/kvm –version QEMU emulator version 3.1.0 (Debian 1:3.1+dfsg-8+deb10u8) Copyright (c) 2003-2018 Fabrice […]

tested on host # debian 10 this option is only available in the gui on newer versions of virsh-manager to create a thin provisioned harddisk of capacity of 32GB image via bash-terminal go: qemu-img create -f qcow2 name-of-harddisk-image.qcow2 32G as […]

hostnamectl; # tested on Static hostname: giada Icon name: computer-desktop Chassis: desktop Operating System: Debian GNU/Linux 10 (buster) Kernel: Linux 4.19.0-17-amd64 Architecture: x86-64 su – root apt update # will install Java Web Start and openjdk-11-jre apt install icedtea-netx java-common […]

every user want’s a fast & responsive internet. BIND and DNS – the Phonebook of the internet – Berkeley Internet Name Domain – how to benchmark dns servers (find fastest) – LibreDNS There is nothing more anoying than slow loading […]

CentOS 7 (maintained until 2024) is hailed a rock-solid GNU Linux Open Source (?) server OS, hardened by many idelaistic developers & RedHat technicians. …and indeed it performed well on it’s xfs filesystem (thanks all involved also thanks to RedHat […]

harddisk encryption is important from critical data to get physically stolen (can’t do much about data that get’s stolen while DEcrypted) (except: to not have any physical network connection while the data is in DEcrypted state?) hostnamectl; # tested on […]

How to created multiple Wifi AccessPoints connecting (WDS Wifi Bridge) to one central Internet-Wifi-AccessPoint – Difference between TL-WA901N and TL-WA901ND where the Chinese and especially TP-Link and Huawai are very strong is data over radio (4G/LTE/5G/Wifi…) especially the TP-Link products […]

the error message basically means: the VM’s screen can not be auto-resized because the VBoxGuestAdditions kernel module drivers software was not properly build & installed. the solution: rebuild & reinstall the VBoxGuestAdditions (kernel module) properly: hostnamectl; # tested on guest […]